34 lines
690 B
TypeScript
34 lines
690 B
TypeScript
import { Vector2, Vector3 } from "three";
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export class Matrix2
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{
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private el = [1, 0, 0, 1];
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set(n11: number, n12: number, n21: number, n22: number)
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{
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let te = this.el;
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te[0] = n11; te[1] = n21;
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te[2] = n12; te[3] = n22;
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return this;
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}
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applyVector(vec: Vector2 | Vector3)
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{
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let x = vec.x, y = vec.y;
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let e = this.el;
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vec.x = e[0] * x + e[2] * y;
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vec.y = e[1] * x + e[3] * y;
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return this;
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}
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setRotate(theta: number): Matrix2
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{
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let el = this.el;
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let c = Math.cos(theta), s = Math.sin(theta);
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this.set(c, -s,
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s, c);
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return this;
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}
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}
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